Decolourization of melanoidin containing wastewater using South African coal fly ash

Vincent O Ojijo, Maurice S. Onyango, Aoyi Ochieng, Fred Otieno

Research output: Contribution to journalArticle

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Abstract

Batch adsorption of recalcitrant melanoidin using the abundantly available coal fly ash was carried out. It had low specific surface area (SBET) of 1.7287 m²/g and pore volume of 0.002245cm³/g while qualitative evaluation of the predominant phases in it was done by XRD analysis. Colour removal efficiency was found to be dependent on various factors studied. Maximum colour removal
was achieved around pH 6, whereas increasing sorbent mass from
10g/L to 200 g/L enhanced colour reduction from 25% to 86% at 298
K. Spontaneity of the process was suggested by negative Gibbs free
energy while positive values for enthalpy change showed endothermic nature of the process. Non-linear optimization of error
functions resulted in Freundlich and Redlich-Peterson isotherms describing sorption equilibrium data best. The coal fly ash had
maximum sorption capacity of 53 mg/g and could thus be used as a
low cost adsorbent in melanoidin removal.
Original languageEnglish
Pages (from-to)17-23
Number of pages7
JournalInternational Journal of Civil and Environmental Engineering
Volume2
Issue number1
Publication statusPublished - 2010

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fly ash
coal
wastewater
sorption
enthalpy
isotherm
surface area
X-ray diffraction
adsorption
cost
removal
evaluation
analysis

Cite this

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title = "Decolourization of melanoidin containing wastewater using South African coal fly ash",
abstract = "Batch adsorption of recalcitrant melanoidin using the abundantly available coal fly ash was carried out. It had low specific surface area (SBET) of 1.7287 m²/g and pore volume of 0.002245cm³/g while qualitative evaluation of the predominant phases in it was done by XRD analysis. Colour removal efficiency was found to be dependent on various factors studied. Maximum colour removalwas achieved around pH 6, whereas increasing sorbent mass from10g/L to 200 g/L enhanced colour reduction from 25{\%} to 86{\%} at 298K. Spontaneity of the process was suggested by negative Gibbs freeenergy while positive values for enthalpy change showed endothermic nature of the process. Non-linear optimization of errorfunctions resulted in Freundlich and Redlich-Peterson isotherms describing sorption equilibrium data best. The coal fly ash hadmaximum sorption capacity of 53 mg/g and could thus be used as alow cost adsorbent in melanoidin removal.",
author = "Ojijo, {Vincent O} and Onyango, {Maurice S.} and Aoyi Ochieng and Fred Otieno",
year = "2010",
language = "English",
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Decolourization of melanoidin containing wastewater using South African coal fly ash. / Ojijo, Vincent O; Onyango, Maurice S.; Ochieng, Aoyi; Otieno, Fred.

In: International Journal of Civil and Environmental Engineering, Vol. 2, No. 1, 2010, p. 17-23.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Decolourization of melanoidin containing wastewater using South African coal fly ash

AU - Ojijo, Vincent O

AU - Onyango, Maurice S.

AU - Ochieng, Aoyi

AU - Otieno, Fred

PY - 2010

Y1 - 2010

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AB - Batch adsorption of recalcitrant melanoidin using the abundantly available coal fly ash was carried out. It had low specific surface area (SBET) of 1.7287 m²/g and pore volume of 0.002245cm³/g while qualitative evaluation of the predominant phases in it was done by XRD analysis. Colour removal efficiency was found to be dependent on various factors studied. Maximum colour removalwas achieved around pH 6, whereas increasing sorbent mass from10g/L to 200 g/L enhanced colour reduction from 25% to 86% at 298K. Spontaneity of the process was suggested by negative Gibbs freeenergy while positive values for enthalpy change showed endothermic nature of the process. Non-linear optimization of errorfunctions resulted in Freundlich and Redlich-Peterson isotherms describing sorption equilibrium data best. The coal fly ash hadmaximum sorption capacity of 53 mg/g and could thus be used as alow cost adsorbent in melanoidin removal.

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